During September the most commonly caught bird on the Chico is almost always Wilson’s Warbler (photo). They are an abundant breeding species from Alaska all across Canada to the eastern Canadian provinces and they are most common in the West. However, so far this fall, both the large Brown Thrasher and the diminutive House Wren have been caught and banded way more times than Wilson’s Warblers; the warblers just beginning to show up in the nets. The amount of black in the warblers’ crown is an indication on its age and gender. This one appears to be an adult male. Banding continues through September and following a cold front the number of birds explodes.